σ-Alkynyl complexes of manganese(I) as η2-bonding ligands for Group 1B metal–ligand fragments. X-Ray crystal structure of [Mn2Cu(µ-CCBut)2(CO)6(dppe)2]PF6·0.5CH2Cl2

Abstract

Several compounds of the types [MnML(µ-CCR)(CO)₃(dppe)]ⁿ⁺{ML = CuCl (n= 0), Au(C₆F₅)(n= 0), or M[P(C₆H₄Me-2)₃](n= 1; M = Cu, Ag, or Au); R = CH₂OMe, Bu^t, or Ph; dppe = Ph₂PCH₂CH₂PPh₂} and [Mn₂M(µ-CCR)₂(CO)₆(dppe)₂]⁺ have been prepared from the alkynyl complexes fac-[Mn(CCR)(CO)₃(dppe)] and the appropriate reagents to generate the metal–ligand fragments ML. The salt [Mn₂Cu(µ-CCBu^t)₂(CO)₆(dppe)₂] PF₆·0.5CH₂Cl₂ has been characterized by X-ray diffraction. Several equilibria in solution involving the cationic species with free σ-alkynyl complex and P(C₆H₄Me-2)₃ have been observed and their reactions with Cl^– have been examined.